From a Home screen, navigate: Apps icon > Settings > Accounts (Personal section).
Tap Add account.
Enter the Gmail address then tap NEXT (located in the lower-right).
Enter the password then tap NEXT.
If presented, configure the following as desired then tap NEXT:
Enabled when a check mark is present.
Automatically back up device data
If presented to Set up payment info, select any of the following then tap CONTINUE:
Add credit or debit card
Use Verizon Wireless billing
If applicable, complete all remaining steps to set up payment info.